Apparatus for use in the manufacture of sheet glass



J. M. FISHER Nov. 14, 1933.

APPARATUS FOR USE IN THE MANUFACTURE OF SHEET GLASS Filed Dec. 2, 1931 2 Sheets-Sheet l INVENTOR B/wudu 9 A TTORNEYS.

oooomooonioomo fi/ Nov. 14, 1933. FlSHER 1,934,794

APPARATUS FOR USE IN THE MANUFACTURE OF SHEET GLASS Filed Dec. 2, 1931 2 Sheets-Sheet 2 .5. .4. .15 g 20 I )t 6 6 Q 5 4 3 I H J IN VEN TOR.

ga /w 77. PM 0mm, F Ju ATTORNEYS.

rPatented Nov." 1 4.

Jb'urgh Plate Glass Pennsylvania 1 Company,' a corporation 'of application ,De mber 2', 1931'. S ar 578,476 t 6 Claims. (o1. '5 -240) My invention is particularly directed to mechanism tofacilitate preparing plateglass-for grinding and polishing operations. It is customary'in edge is imparted to theiplaster; and Fig.5 is a,

the manufacture of plate glass to mount'large sheets of it. upon movable cars which pass beneath grinding and'polishing elements and'the glass must be securelyattached to'the cars. vIn order.

to provide a satisfactory mounting, a plaster'bed is-utilized in whichthe glass is embedded; The.

object of the present invention is'to' facilitate economical andsatisfactory disposal of the plase ter at the edge of the glass and of the car upon whfchit is mounted. 1 t

Heretofore theplaster has been disposed around the glass manually and such operation resulted in considerable loss of material,partic ularly by reason'of thewet plaster overflowing the edge oi the car. My invention is designed to obviate this waste and facilitate securing 'a erence to the accompanying drawings, in whi'ch like numerals indicate corresponding parts.

Fig. 1 is a plan view," partsbein'g broken away. of cars carrying sheet glass embedded in plaster in preparation for grinding and polishing, in which the invention is shown in one form of its application; Fig; 2 is a transverse sectional view taken substantially along the line II-II of Fig.

invention in which certain minor modifications are embodied; Fig. 4 is likewise a fragmentary sectional view of my invention in whicha beveled fragmentary sectional view of another-form of the invention that is particularly adapted for application in preparing a :bed'ior relatively-thin plate glass. e v g In the ordinary course of. grinding andpolishing plate glass; a carlis utilized which is mounted to ride upon a track 2 in order to present glass 3 mounted upon the flat top of the car to grinding and polishing elements. not shown. The glass 7 is ordinarily embedded in wet plaster and pegs 4 are mounted near the edges of the car in order to provide anchorage for the plaster and conse quently; present a firm bed for the glass.- My invention is particularly concerned with the formation of the edge of the plaster bed and in- V cludes a belt 5 trained about a plurality of pulleys 6 and guide shoes 7.. A-plurality of pulleys v 8 are mounted'at the outside edge of the mech-. v anism to retain the belt. positively. in position. In order to insure close engagement of the belt" with the edge of the car, and consequently plassatisfactory bed for the sheet glass. A better un-' derstanding of my invention may be had by ref- 1; Fig. 3 is a fragmentary sectional view of my' 'ter carried thereon, .theguide shoes may be EPA/TENT WO FI EQ 1 formedofseparable portions '9 and lorbetween which springs 11- are. inserted toforcethe belt yieldingly against the edge of the car. Further adjustment is presented by mounting the. guides and pulleys upon a; supporting bracket 12 by meansof bolts 13' that are disposed in slots in V the bracket. The bracket is attached to a guard.

member l l. that is ordinarily utilized to prevent plaster from getting upon the track 2, since it is particularly desired to have the ,car travel very'smoothly during the grinding and polishing operationsy V -It'will be apparent from the foregoing description that the belt provides a yieldable abutment .for theplaster that is spread upon the top of thecar and by reason of the belt being mounted upon pulleys,-it travels with the car. as a result of frictional engagement. Since the belt travels with the car, there is no tendency to disturb the proper setting of the wet plaster and consequently the formation of a firmlretaining bed for the bracket 16 and springs 19 are employed to secure thebracket' 16 in adjusted position. The operation of this form of the device is much the same as the form shown in Figs. 1 and 2.

Another slight modification is shown in Fig. 4 in which a saving of material is achieved by utilizing a guide shoe 2 0 which is provided with an angular portion 21: to force the belt over the edge of the table thereby to bevel the plaster disposed thereon. Pulleys 22 are mounted at intervals within the guide member 20 which is provided with openings to permit'the pulleys to engage the belt. A yieldable adjustment of the belt against the edge of the table may be achieved in the manner shown in Fig, 3.

1 Still another form of my invention is shown in Fig. 5 in which a flat stationary belt 23 is utilized which is secured to a bracket 24 pivotally mounted upon the guard 14, as indicated at 25; .In this form of the invention, the belt as shown engages the top edge of the car and is forced against the plaster by means of a handle 26. Inward movement of the belt may be predetermined by means ofan adjustable bolt 27 mounted upon the bracket 24 adapted to engage a lug 28.

It will be clear from the foregoing description of the various forms of my invention that a simple device is provided which insures economical manipulation of the wet'plaster to secure a satisfactory andfirm b ed for the plate glass upon the cars. As will be apparent from the description of the various forms of my invention, it is obvious that the principles thereof may be utilized to advantage in' many applications and consequently the invention should not be limited except as indicated in the appended claims.

What I claim is:

1. The combination with a car having aflat supportingtop for carrying a sheet of glass to be surfaced of less width than sai'd'topfand means for retaining the plaster used between the edge of the sheet and the edge of the car, comprising a retaining membeiafor the plasterwhichextends-along the edge of the earsupported independently of the car and past'which the car past which the car moves.

3.'The combination with a car having a flat supporting top for carrying a sheet of glass to be surfaced of less width than said top, and means for retaining the plaster used between the edge of the sheet and theaedge of the car,

comprising a retaining member for the plaster which extends along the edge of thecar supported independently of the car and past which the car moves, and means yieldingly pressing the member against the edge of the car.

4. The combination with a car. having a flat supporting top for carrying a'sheetof glass to be surfaced of less width than said top, and means for retaining the plaster used between the edge of the sheet and the edge of the car, comprising a retaining member for the plaster in the form of a strip which extends along the edge of the car, and held against longitudinal movement past which the car moves.

5. The combination with a car having a fiat supporting top for carrying'a sheet of glass to be surfaced of less width than said top, and means for retaining the plaster used between the edge.

of the sheet and the edge of the car, comprising a retaining member'for the plaster in the formv of a strip which extends along the edge of the, car resting on thetop thereof and held against longitudinal movement past which the car moves.

, 6. The'combination with a car having a flatsupporting top for carrying a sheet or" glass to, be surfaced'of less width than, said top, and means for retainingthe plaster used between the edge of the sheet and ,the'edge of the car, comprising a retaining. member for the plaster in the form of an endless belt, which extends along the side.

edge of the car and projects above said top past which the car moves, and means for causing the portionof the belt lying above the top .of the table to incline toward the center line of the table so as to bevel theplaster. j i

JOHN M. FISHER. 

